[Fhb-update_cgp] FHB Update from OK, 04/08/11

[FHB Update - Central GP, Hard Winter Wheat]

Wheat Disease Update – 08 April 2011
Bob Hunger, Extension Wheat Pathologist
Department of Entomology & Plant Pathology
Oklahoma State University

Oklahoma:  Not much new to report over the last 7-10 days regarding wheat diseases in Oklahoma as the drought has limited their spread and development.  Barley yellow dwarf appears to be the most prevalent disease.  I have seen only sparse aphids this spring, so aphids that were abundant last fall most likely are responsible for the BYD symptoms now being seen.  Powdery mildew remains fairly prevalent in many plots and fields around Stillwater but is mostly on the lower leaves.  Dr. Art Klatt (OSU Wheat Breeder/Geneticist) reported seeing severe powdery mildew and low (>5%) incidence of leaf rust on susceptible varieties near Perkins, OK (about 10 miles south of Stillwater).  Wheat around Stillwater is basically around GS 9 (flag leaf fully emerged) but heads are quickly moving up the tillers.  The Diagnostic Lab has had a few samples come into the lab – a couple tested positive for wheat streak mosaic virus, indicating that WSM is present in western, northwestern Oklahoma.

 --Bob Hunger, Extension Plant Pathologist, Oklahoma State University

 For more details, go to the FHB Risk Assessment Tool at http://www.wheatscab.psu.edu/riskTool_2011.html